33 lines
1.1 KiB
Rust
33 lines
1.1 KiB
Rust
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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// Test that we give suitable error messages when the user attempts to
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// impl a trait `Trait` for its own object type.
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trait Foo { fn dummy(&self) { } }
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trait Bar: Foo { }
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trait Baz: Bar { }
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// Subtraits of Baz are not legal:
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impl Foo for Baz { } //~ ERROR E0371
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impl Bar for Baz { } //~ ERROR E0371
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impl Baz for Baz { } //~ ERROR E0371
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// But other random traits are:
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trait Other { }
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impl Other for Baz { } // OK, Bar not a subtrait of Baz
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// If the trait is not object-safe, we give a more tailored message
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// because we're such schnuckels:
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trait NotObjectSafe { fn eq(&self, other: Self); }
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impl NotObjectSafe for NotObjectSafe { } //~ ERROR E0372
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fn main() { }
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